It isn't even 19k vs 17.5k -- in fact, I'm not even sure there's a clear increase in attendance to having Saturday games in November. Here are the relevant raw numbers I pulled from the last five years.
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2011 - vs. Temple (Wednesday, Nov. 2) - 17,490 - ESPN [Ohio 6-3, 3-2]
2010 - vs. Louisiana (Saturday, Oct. 30) - 15,255 [Ohio 6-3, 4-1]
2010 - vs. Buffalo (Thursday, Nov. 4) - 15,112 - ESPNU [Ohio 7-3, 5-1]
2009 - vs. NIU (Saturday, Nov. 21) - 14,756 [Ohio 8-3, 6-1]
2009 - vs. Temple (Friday, Nov. 27) - 14,135 - ESPNU [Ohio 9-3, 7-1] -- Students removed from dorms earlier in the week
2008 - vs. Buffalo (Tuesday, Oct. 28) - 10,042 - ESPNU [Ohio 2-7, 1-4] -- Keep in mind, it was near-freezing, windy, and actually sleeted during the game
2008 - vs. Bowling Green (Saturday, Nov. 8) - 15,018 [Ohio 2-8, 1-5] -- This was PARENTS WEEKEND
2008 - vs. Akron (Saturday, Nov. 22) - 13,114 [Ohio 3-8, 2-5] -- Students out of dorms
2007 - vs. Temple (Friday, Nov. 2) - 15,632 [Ohio 5-5, 3-3]
2007 - vs. Miami (Saturday, Nov. 24) - 11,438 - GTN [Ohio 6-6, 4-4] -- No students in dorms
2006 - vs. Akron (Thursday, Nov. 16, 2006) - 15,631 - ESPNU [Ohio 8-3, 6-1]
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I personally love the schedule this November, but I'm too far away at the moment to drive into a game, and my days off are Wednesday and Thursday.